从零搭建SSH项目之Hibernate3.3项目

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这篇文章是接着上面文章《从零开始搭建一个Struts2项目》继续的纯粹利用Hibernate搭建的一个小例子，想通过这个例子熟悉一下如何搭建一个hibernate环境。本demo采用了Servlet和Hibernate两项技术，下面就一步一步的徒手建立一个Hibernate3.3项目。搭建此项目大致需要九步：
第一步、准备Hibernate项目必备的Jar包。Hibernate项目中必备的Jar包一共有5个分别是antlr-2.7rc1.jar、commons-collections-2.1.1.jar、dom4j-1.6.1.jar、hibernate3.jar、jdbc.jar。
第二步、搭建项目文件结构。首先在磁盘的一个位置新建一个文件夹命名hibernate_demo(项目的名字),然后再hibernate_demo文件夹下面新建文件夹WEB-INF，然后再WEB-INF下面创建两个文件夹classes(放class文件)、lib(放项目中的Jar包)。这样就把项目的文件夹结构搭建完毕。然后将第一步准备的Jar包放入lib文件夹中

第三步、创建servlet。在src下面创建相应包并在包里面创建LoginServlet.java来作为servlet。LoginServlet的代码如下：

package com.qingfeilee.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.hibernate.Session;import org.hibernate.Transaction;import com.qingfeilee.bean.MyUser;import com.qingfeilee.demo.DemoSessionFactory;public class LoginServlet extends HttpServlet {public LoginServlet() {super();}public void destroy() {super.destroy();}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request,response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {Session session = DemoSessionFactory.currentSession();Transaction t = session.beginTransaction();t.begin();MyUser user = new MyUser();user.setUserId("1");user.setPassword("11");user.setUserName("22");session.save(user);t.commit();DemoSessionFactory.closeSession();}public void init() throws ServletException {}}

第四步、servlet创建后需要配置web.xml文件。web.xml文件的代码如下：

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">   <servlet>    <description>This is the description of my J2EE component</description>    <display-name>This is the display name of my J2EE component</display-name>    <servlet-name>LoginServlet</servlet-name>    <servlet-class>com.qingfeilee.servlet.LoginServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>LoginServlet</servlet-name>    <url-pattern>/servlet/LoginServlet</url-pattern>  </servlet-mapping></web-app>

第五步、准备项目的视图文件。视图文件就是一个login.jsp文件。该文件的代码如下：

<%@ page language="java" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>演示struts2</title></head><body><form action="servlet/LoginServlet" method = "post"><table><tr><td>用户名：</td><td><input type="text" name="userName" /></td></tr><tr><td>密码：</td><td><input type="password" name="password" /></td></tr><tr><td colspan="2"><input type="submit" value="提交"><input type="reset" value="重置"></td></tr></table></form></body></html>

第六步、创建Hibernate的配置文件hibernate.cfg.xml，并将此文件放入到src文件夹下面。hibernate.cfg.xml的代码如下：

<?xml version='1.0' encoding='UTF-8'?><!DOCTYPE hibernate-configuration PUBLIC          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><hibernate-configuration>     <session-factory>    <property name="current_session_context_class">thread</property>         <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>        <property name="connection.url">jdbc:oracle:thin:@192.168.1.121:1521:jcs</property>        <property name="connection.username">jcs_jbpm</property>        <property name="connection.password">jcs_jbpm</property>        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>        <property name="myeclipse.connection.profile">oracle</property>                <mapping resource="com/qingfeilee/bean/MyUser.hbm.xml"/>    </session-factory></hibernate-configuration>

第七步、创建数据库对应的model实体bean，起名为MyUser.java。代码如下：

package com.qingfeilee.bean;public class MyUser implements java.io.Serializable {private String userId;private String userName;private String password;public String getUserId() {return this.userId;}public void setUserId(String userId) {this.userId = userId;}public String getUserName() {return this.userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return this.password;}public void setPassword(String password) {this.password = password;}}

第八步、创建和实体bean对应的映射文件MyUser.hbm.xml，其代码如下：

<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping>    <class name="com.qingfeilee.bean.MyUser" table="MY_USER" schema="JCS_JBPM">        <id name="userId" type="java.lang.String">            <column name="USER_ID" length="20" />            <generator class="assigned" />        </id>        <property name="userName" type="java.lang.String">            <column name="USER_NAME" length="20" />        </property>        <property name="password" type="java.lang.String">            <column name="PASSWORD" length="20" />        </property>    </class></hibernate-mapping>

第九步、创建hibernate的SessionFactory，在本例子中命名为DemoSessionFactory.java，该类的代码如下：

package com.qingfeilee.demo;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class DemoSessionFactory {public static final SessionFactory sessionFactory;static{sessionFactory = new Configuration().configure().buildSessionFactory();}public static final ThreadLocal<Session> localThread = new ThreadLocal<Session>();/** * author:qingfeilee * date:2012-03-05 * description:获取当前session * **/public static Session currentSession(){Session s = (Session)localThread.get();if(s == null){s = sessionFactory.getCurrentSession();localThread.set(s);}return s;}/** * author:qingfeilee * date:2012-03-05 * description:关闭当前session * **/public static void closeSession(){Session s = localThread.get();localThread.set(null);if(s != null && s.isOpen()){s.close();}}}

至此整个项目就创建完毕，将项目放到tomcat的webapp下面启动tomcat即可通过浏览器来访问本项目。下周将会介绍一下如何创使用spring。以此demo来奋斗在技术一线的战友共同进步。
如有不对还请各位指正和补充，如需转载还需注明出处http://blog.csdn.net/qingfeilee/article/details/7326637，谢谢！